Braking system



L. E. LA BRIE BRAKING SYSTEM Nov. ll, 1930.

f Filed Aug. 12,

1925 2 Sheets-Sheet l INVENTOR /Q 'Mf/E ATTORNEY v 1 ;15, LA BRIE Nov. 1l, 1930.

BRAKING SYSTEM 2 Sheets-Sheet 2 Filed Aug. l2 1925 F. ,4, INVENTOR ATTORNEY Patented Non, ll, 'i832 unirse srn'ras earner orales LUDGER, LA BRIE, F SQUTH BEND, IWEN, SSIGNOI@ T@ REMIX BRAKE CIEPANY, 0F CHCAGO, HALINQES, A CORPGRATEGN 0F ELMGES Application tiled Aumst l2, w25. serial No, 48,786.,

This invention relates to brakes, and is illustrated as embodied in an automobile chassis having front wheel brakes and a transmission brake acting on the rear Wheels.,

o The invention is generally associated with means for utilizing a transmission brake as a servo device for applying brakes on dirigible Wheels, forming the subject` matter of my divisional application, Serial No. lo 462,472, filed June 20, 1930.

The transmission brake embodies a numloer of features of novelty, including a novel arrangement of three shoes acting on the propeller shaft, a very simple control arrangement including a shaft supported by the transmission, and other features which will be apparent from the following description of one illustrative embodiment of the invention shown in the accompanying; drawings,

20. in which:

' Fig. l is a, top plan view of an antonio` bile chassis, showing; diagrammatically one possible arrangement;

Fig., 2 is a vertical section longitudinally 255 of the car tlrrou l1 the transmission brake;

Fig. 3 is a vertical section on the line 3f-3 of Fig, 2, showing the shoes in side eleva tion; and

Figi;w i is a vertical section on the line fil- 4l Se of Fig. 2, sho-Wing tlie movement-limiting springsa Fig. 5 is a side elevation of the brake pedal and its connections. v e

ln the cliassis diagrammetically sliovvn in Fig., l, a frame l@ is supported by the usual springs on a front axle 12 and a rear axle M. The front wlieelsl have brakes it operated tlirougli brake rods i8 by rocking a cross shaft 20., The rear wlieels 22 are driven from an engine 2t tlirougli a transmission 26 and propeller shalt 28. Except as further described below, these parts or their equivalents may be of any desired construction.,

The brakes may loe/applied by any suitable device, a service pedal d@ being shown, and,

having one end below its fulcruin forked or slottedto embrace an arm 32 on a vertical shaft 34 having a crank 36 connected' by e link 38 to an arm t() extending upwardly from a brake-applying shaft 42.,

Shaft i2 is slidablysupported at one end on inner and outer spherical shells t6 and e8, held by a spring conlined between shell 48 and a stop 52 on the sleeve i4. Shells a6 and 48 embrace a spherical part of a stationary support 5ft secured to the transmission 28n At its opposite end, sliaft d2 is flattened and perforated to be stvivelled by a vertical pin 56 between approximately semi-cylindrical connectors 58 held in a. cylindrical bore in the end of a short shalt 6G 'carryinga double cani 62., i

Cam 62 is arranged to force apart, against the resistance of a. return spring de, a re'- verse slice 6d and a servo shoe 68, the servo shoe 68 turning with the drum 70 and forcing. against the drum a central shoe 72 to which it is pivotally connected at 7a. Dun iup tlie initial movement of slioe 68, slice 72 is ield away from the drurn'by an auxiliary spring 78, insuring sinootli 4and gradual effectiveness of the slicesc Slice 88 is anchored at 7 8 between the ends of slice 2 2, and shoe l2 is anchored at 80 between the ends of slioe 66, slices 66 and 68 preferably being forked to straddle or overlap tire ends of slice 72., Both anchors 78 and 88 may be carried by a backing plate or other support 82 at the open side of the drum; Bruin lll is shown as secured to and rotating with the propeller shaft 28, while support-82 is provided vvitli a tubular projection 84;, sleeved for support on a tubular part 88 ci the housing of the transmission 26.,

When tlie brake is applied by depressing tlie pedal, the support 82 is turned in one direction or the other with tlie drum, slices 68 and 'f2 bein eiiective if the veliicle is moving forvvar and slice 66 beingedective if the vehicle is moving backward. This anguiar movement is yieldingly limited by two pairs of springs 88 and 90, embracing arms 82 and 94e secured to tlie support, and coniined between upper and lower brackets 96 carried by frame l0, l v

After support 82 comes to rest, the fricby a sleevedl lield by tubular anges formed es v tion means shown as including shoes 66, 68, and '72 acts as a transmission brake to retard movement of the rear wheels 22 through the propeller shaft 28 and through the differential in the rear axle 14, the diderential sponding arm and having an adjustable nut 102 or other stop engaging the bottom of the arm. This constitutes `an over-runninr connection, so that if the drum 70 is turning in one direction the one arm 100 rocks shaft 20, and if the drum is turning in the opposite direction the other arm 100 rocks the shaft, but in either case the shaft 20 applies the front brakes. If desired, a light anti-rattle spring 104 may hold each arm `100 against its sto 102 when the brakes are not applied.

t is important to note that springs 88 and 90 yield in proportion to the depression of pedal 30, and that consequently the pressure on the front brakes, as well as the retarding eii'ect of the transmission brake, is controlled .by the pedal. Arm 40 is soV formed and so arranged that, when the brakes are on, its joint with link 38 is directly in a vertical axis passmovement of support 82, permitted by the universal joints at opposite ends of shaft 42, does not affect the pressure put on the shaft by depression of the pedal.

While onel illustrative embodiment has been described in detail, it is not my intention to limit the sco e of the invention to that particular embodiment, or otherwise than by the terms of the appended claims.

I claim:

1. A vehicle having, in combination, a

transmission and a power shaft extending rearwardly therefrom and driving the vehicle wheels through the differential, a drum rotating with the shaft, a pair of shoes anchored at one endof one shoe within the drum and so connected that the unanchored shoe moves with the drum to force the anchored shoe against the drum to retard movement of the shaft in the direction it turns `when theevehicle is moving forward, a third 4drum and expansible against the drum, an

anchor for each of a pair of the vshoes between the ends of the other. of the pair, and

In testimony whereof I havefhereunto ,o

signed my name.

v LUDGER ELIZ LA BRIE. 

